North Sea

IHO sea area 4 · -4° to 12° E, 51° to 61° N

in force
1
last 12 months
7
since 1997
4,732
categories
11

In force now · 1

  1. HYDROLANT 1496/26 · Surveys2026-08-03
    Survey operations are underway in the North Sea near Norway by the vessel Ramform Hyperion towing ten 2740-meter cables, requesting a three-mile berth.

Longest in force

  1. HYDROLANT 1496/26 · Surveys2026-08-03
    Survey operations are underway in the North Sea near Norway by the vessel Ramform Hyperion towing ten 2740-meter cables, requesting a three-mile berth.

By year

97
98
99
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
26

By month (all years)

J
F
M
A
M
J
J
A
S
O
N
D

By category · since 1997

Nav aids2,50353%
Other66914%
Cable ops65814%
Surveys58312%
Wrecks1704%
Containers441%
Derelicts341%
Exercises321%
Debris291%
Mines90%
Missiles10%

Archive · 4,731 cancelled

  1. HYDROLANT 685/03 · Nav aids2003-04-02 → 2003-04-04
    Duncansby head light 58-38.6N 003-01.5W unreliable
  2. HYDROLANT 636/03 · Surveys2003-03-26 → 2003-03-31
    Survey operations in progress until further notice by M/V confidante 5 vicinity of trackline joining…
  3. HYDROLANT 582/03 · Surveys2003-03-18 → 2003-03-26
    Underwater operations in progress until further notice by M/V terramare in 52-32.8N 002-03.8E
  4. HYDROLANT 563/03 · Wrecks2003-03-14 → 2003-07-19
    Dangerous wreck reported in 54-02.12N 004-45.85E marked by: a. east cardinal buoy
  5. HYDROLANT 554/03 · Surveys2003-03-12 → 2003-03-23
    Survey operations in progress until further notice by M/V confidante in area bound by 51-44N 001-29E, 51-55N…
  6. HYDROLANT 552/03 · Other2003-03-12 → 2003-03-14
    Unexploded ordnance vicinity 53-36.4N 002-01.3E
  7. HYDROLANT 543/03 · Nav aids2003-03-12 → 2003-03-13
    Mrsc shetland 60-10N 001-08W mf dsc off air
  8. HYDROLANT 436/03 · Other2003-02-25 → 2003-03-04
    Unexploded ordnance in 53-36.7N 001-56.8E
  9. HYDROLANT 421/03 · Nav aids2003-02-24 → 2003-02-27
    Sandettie east buoy 51-15N 002-03E unlit
  10. HYDROLANT 404/03 · Other2003-02-21 → 2003-04-17
    Pipelaying operations in progress until further notice by barge lorelay vicinity of trackline joining…
  11. HYDROLANT 395/03 · Surveys2003-02-20 → 2003-02-22
    Underwater operations in progress until further notice by M/V goosander with submersible vicinity 51-29N…
  12. HYDROLANT 356/03 · Nav aids2003-02-14 → 2003-02-21
    Sandettie east buoy 51-15N 002-03E unlit
  13. HYDROLANT 338/03 · Nav aids2003-02-12 → 2003-02-12
    Dgps station at flamborough head light 54-07N 000-05W inoperative until 121500Z feb
  14. HYDROLANT 322/03 · Nav aids2003-02-10 → 2003-02-11
    Dgps station at flamborough head light 54-07N 000-05W unreliable
  15. HYDROLANT 317/03 · Nav aids2003-02-10 → 2003-07-26
    Light, fog signal (u), RACON (o) established in 51-16.5N 002-26.9E
  16. HYDROLANT 281/03 · Nav aids2003-02-06 → 2003-02-06
    Winterton old lighthouse station RACON 52-43N 001-42E inoperative 060900Z to 061500Z feb
  17. HYDROLANT 264/03 · Cable ops2003-02-05 → 2003-02-09
    Underwater operations in progress until further notice by cableship maersk defender vicinity 51-14N 002-17E
  18. HYDROLANT 241/03 · Cable ops2003-02-01 → 2003-02-05
    Underwater operations in progress until further notice by cableship maersk defender vicinity 51-15N 002-18E
  19. HYDROLANT 234/03 · Wrecks2003-01-31 → 2003-03-14
    Dangerous wreck reported in 54-02.15N 004-45.80E marked by: a. east cardinal buoy
  20. HYDROLANT 227/03 · Cable ops2003-01-31 → 2003-02-01
    Underwater operations in progress until further notice by cableship maersk defender vicinity 51-14N 002-17E

Sea boundaries: Flanders Marine Institute (2018), IHO Sea Areas v3, marineregions.org (CC BY 4.0). Not for navigation — follow official NAVAREA / coastal broadcasts.